No offense to the fine concierges at the Peninsula, but the information he'll get here in FT will be far more complete than what the concierge will come back with, which will be (a) take the hotel car, (b) take the limobus, here's the schedule, or (c) take the train and then a taxi, here's the schedule. With a cautionary note that you should consider them in that order, since Tokyo is sooo difficult to get around.